Microsolv Headspace Crimp Cap 20 mm, with grey Butyl/clear Molded Pharmafix Fitted Septa Safety, silver, 100 pc/PAK

Caps, Headspace, Crimp Top, with Grey Butyl Rubber / Partially Laminated PTFE Septa, fitted in Aluminum, Silver Pressure Relief Caps with 8mm center holes. Pharma-Fix. For use with 20mm Crimp Top Headspace Vials. MicroSolv Brand